TY - JOUR
T1 - Pd catalyst promoted by two metal oxides with different reducibilities
T2 - Properties and performance in the selective hydrogenation of acetylene
AU - Kim, Eunseon
AU - Shin, Eun Woo
AU - Bark, Chung Wung
AU - Chang, Ilwon
AU - Yoon, Won Jung
AU - Kim, Woo Jae
N1 - Funding Information:
This work was supported by the Human Resources Development program (no. 20124030200010 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy .
PY - 2014/2/10
Y1 - 2014/2/10
N2 - La oxide is known to be the best promoter among reducible metal oxides for acetylene hydrogenation. However, it requires high-temperature reduction, which is not feasible in commercial processes. To maintain the enhanced catalytic performance by La oxide addition while lowering the reduction temperature for application in commercial process, we added Ti oxide as a second promoter, which has a higher reducibility than La oxide. The Ti oxide is added to the Pd surface, which has been partially covered by La oxide, and maintains the modified geometric and electronic structures of the Pd catalyst induced by the high-temperature-reduced La oxide even after low-temperature reduction, as confirmed by H2 chemisorption and X-ray photoelectron spectroscopy. Surprisingly, Ti oxide further modifies the electronic structure of Pd, even for low-temperature reduction, due to its high reducibility, leading to higher ethylene selectivity than when La oxide is used exclusively. We also confirmed that a similar additive effect also applies to other metal oxides, i.e., Nb 2O5.
AB - La oxide is known to be the best promoter among reducible metal oxides for acetylene hydrogenation. However, it requires high-temperature reduction, which is not feasible in commercial processes. To maintain the enhanced catalytic performance by La oxide addition while lowering the reduction temperature for application in commercial process, we added Ti oxide as a second promoter, which has a higher reducibility than La oxide. The Ti oxide is added to the Pd surface, which has been partially covered by La oxide, and maintains the modified geometric and electronic structures of the Pd catalyst induced by the high-temperature-reduced La oxide even after low-temperature reduction, as confirmed by H2 chemisorption and X-ray photoelectron spectroscopy. Surprisingly, Ti oxide further modifies the electronic structure of Pd, even for low-temperature reduction, due to its high reducibility, leading to higher ethylene selectivity than when La oxide is used exclusively. We also confirmed that a similar additive effect also applies to other metal oxides, i.e., Nb 2O5.
KW - Acetylene hydrogenation
KW - La oxide
KW - Low temperature reduction
KW - SMSI
KW - Ti oxide
UR - http://www.scopus.com/inward/record.url?scp=84890480784&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2013.11.036
DO - 10.1016/j.apcata.2013.11.036
M3 - Article
AN - SCOPUS:84890480784
SN - 0926-860X
VL - 471
SP - 80
EP - 83
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
ER -